MC80F0804D View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MC80F0804D

8-BIT SINGLE-CHIP MICROCONTROLLERS

Unspecified 

MC80F0704/0708/0804/0808

may not be obtainable due to coupling noise. Therefore, avoid ap-

plying pulses to pins adjacent to the pin undergoing A/D conver-

sion.

(4) AVDD pin input impedance

A series resistor string of approximately 5KΩ is connected be-

tween the AVREF pin and the VSS pin. Therefore, if the output im-

pedance of the analog power source is high, this will result in

parallel connection to the series resistor string between the

AVREF pin and the VSS pin, and there will be a large analog sup-

ply voltage error

Note: If the AVREF voltage is less than VDD voltage and an-

lalog input pins(ANX), shared with various alternate func-

tion, are used bidirectional I/O port, the leakage current

may flow VDD pin to AVREF pin in output high mode or an-

lalog input pins(ANX) to AVREF pin in input high mode.

VDD

AVREFS (PSR1.3)

ADEN

Resistor Ladder Circuit

AN0 / AVREF

AN1

MUX

Sample & Hold

Successive

Approximation

Circuit

ADCIF

ADC

INTERRUPT

AN14

AN15

ADS[3:0] (ADCM[5:2])

ADC8

01

10-bit Mode

98

A10D-CbiRt A(D10C-Rbit)

ADCRH

ADCRL (8-bit)

10

ADC Result Register

8-bit Mode

98

32

10-bit ADCR

00

ADCRH

ADCRL (8-bit)

10

ADC Result Register

Figure 14-3 A/D Block Diagram

October 31, 2011 Ver 1.03

71

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